[QGIS-Developer] GRASS r.walk

[Paulo van Breugel]

Hi Josh,

I would suggest to send questions to the grass user and/or developers list (
https://grass.osgeo.org/support/mailing-lists/).

Best wishes,

Paulo


On Thu, Nov 23, 2017 at 9:50 PM, Joshua Quesenberry <engnfrc at gmail.com>
wrote:

> Is it normal for an r.walk over an area of 10,500 acres to use up 12GB of
> HD space and want more? That’s using up every bit of space I have left, so
> it’s crashing out. I tried setting the maximum cost to 10 and I think 1
> also, but the algorithm keeps running for a long time making these really
> large files…
>
>
>
> Thanks,
>
>
>
> Josh Q
>
>
>
> *From:* Joshua Quesenberry [mailto:engnfrc at gmail.com]
> *Sent:* Thursday, November 23, 2017 12:05 PM
> *To:* qgis-developer at lists.osgeo.org
> *Cc:* engnfrc at gmail.com
> *Subject:* GRASS r.walk
>
>
>
> Happy Thanksgiving Everyone!
>
>
>
> Who’s very familiar with GRASS r.walk? I’m finding some tutorials and man
> pages with examples but having trouble applying what I’ve found. I’m trying
> to create mobility models for use with lost person analytics.
>
>
>
> Does is matter what format the input layers are in? Should they all be UTM
> since that’s in meters? Or is it smart enough to mix and match WGS84 and
> UTM layers? And along the same lines, does my DEM need to have cells in
> meters? Most of what I get comes native in WGS84 with altitudes in feet, so
> if I don’t need to add extra steps converting to UTM and cells to meters
> that’s a good thing.
>
>
>
> For the friction layer, the example on the man page appears to use
> landclass96 and only has 7 classifications… the NLCD 2011 land
> classification file I have has 30-40 classifications ranging from 11 to 95,
> does anyone have friction costs that can be applied to this data? Or at the
> very least some idea of the best method to use to come up with those values
> myself?
>
>
>
> Thanks!
>
>
>
> Josh Q
>
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